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A student crosses two true-breeding pea plants one with green pods and the other with yellow pods. If yellow is dominant over green what phenotypic results will the student find in the F1 generation?
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Why did one of the characteristics for example dwarfness or white flower color disappear in the F1 generation of Mendal's crosses?
Since the F1 generation of crosses is a cross between two pure traits (for example, TT for tall and tt for short/dwarfness), the offspring of the pure parents all have the genotype of Tt: 100% of offspring will be tall. The dwarfness seems to "disappear" because the capital T is dominant, while the lowercase t (for shortness) is recessive. Dominant dominates a recessive trait, so only tallness appears and dwarfness seems to disappear. Additional Info: However, even though the dwarfness seems to "disappear" it is still in the genotype although it does not appear in the F1 generation. In the F2 generation, there will be a 25% chance of the offspring having the trait dwarfness, because the F1 generation is crossed (Tt x Tt).
How did the results of Mendel's dihybrid crosses lead him to formulate the law of independent assortment?
When crosses were made taking into account two dominant charater in a parent with another parent having racessive genes for those characters, in F1 generation all plants had dominant characters but in F2 generation, on self-pollination, the segregation in both the characters were observed independent of each other.
What factors contribute to the success of Mendels experiment?
the reason they are so reliable is because he used peas as his plant of interest. an peas have only 2 different things they can be. short or tall. so it was easy to conclude all of the different outcomes of the offspring of the pea plants because of the of his drawn punnett square. which shows that if a tall dominant pea plant goes with a short it will be tall. and if it goes with a tall it will be tall. but if short goes with short then it will be short. so only 25% vof the time a pea plant will be short
When would a pedigree be better to use to deterimine the genotype of an individual instead of a testcross?
n genetics, a test cross, first introduced by Gregor Mendel, is used to determine if an individual exhibiting a dominant trait is homozygous or heterozygous for that trait. More simply put, test crosses determine the genotype of an individual with a dominant phenotype.
Mendel's dihybrid crosses but not his monohybrid crosses show that?
no
How is math familiar with the punnett square?
Math is involved after you complete the punnett square because you find the phenotypic ratio, so that is numbers[while the genotype is letters with dominant and recessive gene alleles]. In the genotype part, you find the genotypic fractions of different matches out of the given number of crosses. For example, if you do four crosses with Aa and Aa in a punnett square, you will have 3/4 dominant A and 1/4 recessive a as the four crosses, which are the genotypic fractions. The phenotypic ratio is 1 dominant pair, 2 heterozygous, and 1 recessive pair, or 1:2:1.
What phenotypic ratios are likely to occur in crosses when dealing with two completely dominant independently segregating gene pairs when both parents are fully heterozygous?
9:3:3:1
Which observation of dihybrid crosses led to mendels law of independent assortment?
When crosses were made taking into account two dominant charater in a parent with another parent having racessive genes for those characters, in F1 generation all plants had dominant characters but in F2 generation, on self-pollination, the segregation in both the characters were observed independent of each other.
What is the phenotypic ratio for dihybrid crosses?
That depends on the gametes. The most common is 9:3:3:1
Why did mendel perfrom so many crosses for the same characteristics?
The first few showed the dominant characteristics, but after so many crosses, the recessive traits began to show.
Why did one of the characteristics for example dwarfness or white flower color disappear in the F1 generation of Mendal's crosses?
Since the F1 generation of crosses is a cross between two pure traits (for example, TT for tall and tt for short/dwarfness), the offspring of the pure parents all have the genotype of Tt: 100% of offspring will be tall. The dwarfness seems to "disappear" because the capital T is dominant, while the lowercase t (for shortness) is recessive. Dominant dominates a recessive trait, so only tallness appears and dwarfness seems to disappear. Additional Info: However, even though the dwarfness seems to "disappear" it is still in the genotype although it does not appear in the F1 generation. In the F2 generation, there will be a 25% chance of the offspring having the trait dwarfness, because the F1 generation is crossed (Tt x Tt).
Why did Gregor Mendel perform so many crosses for the same characteristics?
The first few tests showed the dominant characteristics, but after so many crosses, the recessive traits began to show.
In pea plants inflated pods are dominant to constricted pods what crosses is a test cross?
RR x rr
When should you use punnett squares?
Punnett Squares are used to depict crosses of the parental or P generation and the possible offspring or F1 generation which can be formed from the traits being looked at which are represented by letters such as W for widow's peak, w for none, Y for yellow, y for green, so on and so forth. The diagrams depict the possibility of each offspring inheriting a specific/specific traits. Depending on the number of characteristics being looked at, the punnett square will range in size; the simplest is a 2x2 which states the possibility of offspring have 2 traits (2 traits of parents are being looked at; that is, whether or not parents have a characteristic/feature in relation to the possibility that their offspring will or will not). Ultimately, the outcomes depend on whether or not a trait is dominant, heterozygous, or recessive Dominant traits, represented by uppercase letters, generally overpowers the recessive traits which are represented by lowercase letters. Moreover, phenotypic and genotypic ratios can be found through Punnett Square crosses. Phenotypic ratios refer to the number of offspring with each specific physical characteristic/trait coded for by the different letter combinations and the genotypic ratios refer to the number of offspring with each different code. These ratios are separated by numbers and colons and begin at the top left corner of the square. Make sure to simplify if needed. For example: A homozygous dominant plant (RR) is crossed with a heterozygous round plant (Rr) --> RR x Rr RR x Rr: RR RR Rr Rr Phenotypic Ratio: 1 Round (100% chance of offspring being round) Genotypic Ratio: 1 RR: 1 Rr (50% chance of offspring being RR/Rr)
What crosses will result in dominant phenotype offspring?
Don't give us the options then!! If one parent had 2 dominant genes then all offspring would have dominant phenotype, the same goes for both parents having dominant genes.
When mendel crosses a true-breeding short plant with a true-breeding tall plant all offspring were tall. which term describes the gene for tallness?
Dominant.
What are the possible offspring outcome if parent one Tt crosses with parent to tt?
A heterozygous cross.Tt X TtOne homozygous dominant--TTTwo heterozygous dominant---TtOne homozygous recessive--ttAll on a statistical average outcome.
